public static Borrowing Issue(Patron patron, BorrowableItem item)
{
Borrowing ret = null;
if (item.BorrowedBy != null)
throw new BookBorrowedException();
ret = new Borrowing(patron, item);
item.BorrowedBy = ret;
patron.BorrowedBooks.Add(ret);
return ret;
}
public void ReturnBook(Borrowing borrowing)
{
try
{
borrowing.ReturnBook();
_RecordOfBorrowings.Remove(borrowing.Item.Title);
}
catch (ReturnBookException e)
{
Console.WriteLine(e.Message);
}
}